I think you are right in not having any regrets. Money is just money, especially when we have made the commitment to a living animal. I bought a $1000 dollar emerald tree boa from an expo, only to have it die within 1 week (I will forever blame myself for this one as I did not do enough for it.) I commend you on your immediate rise to action. Your vet has given you all the information you need and you sound VERY committed to his recovery. Do not doubt yourself one bit.
I have noticed your name and your effort put into each post, and I thank you for your contributions here. I am a newish member, and am forever grateful for all the information shared here. This is site is mildly representative of how the hobby should be. However, I do not think we should be discouraging any type of commentary or discussion unless it's obviously inappropriate.
I wish your family the best of luck with Yafe's recovery, and will continue to follow along.